Improvement in air-traps for steam-radiators



a. W. BLAKE.

AIR-TRAP FOR STEAM RADIATORS.

Patented May 23,, 1876.

.UNITED STATES PATENT. Orrron.

GEORGE W. BLAKE, OF NEW YORK, N. Y.

IMPROVEMENT IN AlR-TRAPS FOR STEAM-RADIATORS.

Specification forming part of Letters Patent No. 177,793, dated May 23, 1876; application filed April 11, 1876.

To all whom it may concern v Be it known that LGEORGE W. BLAKE, of the city, county, and State of New York, have invented an Improvement in Air-Traps for Steam-Radiators; and I do hereby de olare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, which forms part of this specification.

My invention is an improvement upon an invention for which Letters Patent N 0. 92,571, dated July 13, 1869, were granted to me, being an improvement in air-traps, which permits the admission of air to the interior of steam-radiators when the steam is shut off from said radiator, and the expulsion of air from the same upon the admission of steam thereto, Without the escape of steam after the trap has been heated by said steam.

The objects of the improvement for which I now apply for Letters Patent are the sim-' plification of the mechanism by the substitution of less complicated parts for others employed in my original air-trap, and provision for greater facility in reaching the valve and valve-seat, for cleaning and other purposes.

A in the drawing represents a hollow cylinder ofordinary steam-pipe, provided at one end with a screw-cant), and screw-threaded at the opposite end, forinsertioninto the steamradiator at that part where the air-cock is usually inserted. j

Within the cylinder A is a three -leaved buckling spring, B S B, the leaves B B of which are of brass, and the middle leaf of which is of steel or iron. The said middle leaf is provided with heads h h, and in beveled grooves g the ends of the brass leaves are caused to engage, said brass bars being of a length which causes them to buckle or bend outward.

The bucklin g-sprin g is partly supported and kept from turning by the support-screw m,

which is screwed into the side of the said cylinder near the end which is inserted into the radiator. I

A valve-box, B, is screwed into the side of the cylinder A near the middle thereof. The valve or is fitted to a seat on the inner part of the valve-box R, which is closed at its outer cylinder 0, and, passing through holes in the middle of the brass leaf B and the middle lea-f S of the bueklin g spring, screws into the brass leaf B.

It is plain that the buckling of the brass bars which takes place under the action of heat through the unequal expansion of the leaves B S B will draw the valve a down upon its seat,-aud that when the buckling spring cools, the valve will be pushed away from its seat. Therefore, when the steam is shut ofl from the radiator and the buckling spring cools, the valve 64 opens and admits air to the interior of the radiator. On the contrary, when steam enters the radiator, the air is forced out of the same until steam finally enters the cylinder A. The buckling spring is then heated, the valve closes, and the escape of steam is prevented.

This construction enables me to dispense with the separate spring used for opening the valve in my former invention, hereinbefore referred to, and also to reach the valve for cleaning, 8w, by simply unscrewing the plug P, instead of taking out the entire valve-box.

I claimt The combination of the three-leaved buckling spring B S B, the cylinder A, the valvebox R, and the inwardly-closing valve 01., with its stem 15 penetrating through the leaves B and S of the buckling spring nearer the valveseat, and secured to that leaf, B, farthestfrom the seat, substantially as described.

GEO. W. BLAKE. Witnesses:

MICHAEL RYAN, FRED. HAYNES. 

